This historic milestone is rekindling old debates over birth control, protecting natural resources and reducing consumption. It also has many people wondering whether the Earth can support so many people.
But will this number continue to rise in nfuture years - and if so, what could this mean?Watch this video from BBC's Fergus Walsh to find out.
Where do you fit in this story of human life? Click here and fill in your date of birth to find out.
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